Shia LaBeouf discussed on Jimmy Kimmel Live his new movie Honey Boy and how he wrote the film while in rehab.

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"They said you have PTSD you gotta start writing because this is how you get to the solution. The only way out is through so I started writing all these dark chapters of my life," the actor said on Wednesday about the experience.

"It wound up being this script-form thing, sent it to my friend, became a movie," he continued.

Honey Boy, which opens in theaters on Friday, also stars LaBeouf as a fictionalized version of his father. The film features Noah Jupe and Lucas Hedges portraying a young and older version of a character based on LaBeouf.

The movie, directed by Alma Har'el, chronicles LaBeouf's struggles as a child actor and his tense relationship with this father.

"My dad's a pretty off-color character, he wasn't like too enthused about me playing him," LaBeouf said.

"So I lied to him and told him that Mel Gibson would be playing him," he continued about how he got his father to sign off on Honey Boy.